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/* EINA - EFL data type library
* Copyright (C) 2011 Vincent Torri
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library;
* if not, see <http://www.gnu.org/licenses/>.
*/
#ifndef EINA_INLINE_LOCK_WIN32_X_
#define EINA_INLINE_LOCK_WIN32_X_
#ifndef WIN32_LEAN_AND_MEAN
# define WIN32_LEAN_AND_MEAN
#endif
#include <windows.h>
#undef WIN32_LEAN_AND_MEAN
typedef CRITICAL_SECTION Eina_Lock;
typedef struct _Eina_Condition Eina_Condition;
typedef struct _Eina_RWLock Eina_RWLock;
typedef DWORD Eina_TLS;
typedef HANDLE Eina_Semaphore;
typedef Eina_Lock Eina_Spinlock;
#if _WIN32_WINNT >= 0x0600
struct _Eina_Condition
{
CRITICAL_SECTION *mutex;
CONDITION_VARIABLE condition;
};
struct _Eina_RWLock
{
SRWLOCK mutex;
Eina_Bool is_read_mode : 1;
};
#else
struct _Eina_Condition
{
int waiters_count;
CRITICAL_SECTION waiters_count_lock;
CRITICAL_SECTION *mutex;
HANDLE semaphore;
HANDLE waiters_done;
Eina_Bool was_broadcast;
};
struct _Eina_RWLock
{
LONG readers_count;
LONG writers_count;
int readers;
int writers;
Eina_Lock mutex;
Eina_Condition cond_read;
Eina_Condition cond_write;
};
#endif
EAPI extern Eina_Bool _eina_threads_activated;
static inline Eina_Bool
eina_lock_new(Eina_Lock *mutex)
{
InitializeCriticalSection(mutex);
return EINA_TRUE;
}
static inline void
eina_lock_free(Eina_Lock *mutex)
{
DeleteCriticalSection(mutex);
}
static inline Eina_Lock_Result
eina_lock_take(Eina_Lock *mutex)
{
#ifdef EINA_HAVE_ON_OFF_THREADS
if (!_eina_threads_activated) return EINA_LOCK_SUCCEED;
#endif
EnterCriticalSection(mutex);
return EINA_LOCK_SUCCEED;
}
static inline Eina_Lock_Result
eina_lock_take_try(Eina_Lock *mutex)
{
#ifdef EINA_HAVE_ON_OFF_THREADS
if (!_eina_threads_activated) return EINA_LOCK_SUCCEED;
#endif
return TryEnterCriticalSection(mutex) == 0 ? EINA_LOCK_FAIL : EINA_LOCK_SUCCEED;
}
static inline Eina_Lock_Result
eina_lock_release(Eina_Lock *mutex)
{
#ifdef EINA_HAVE_ON_OFF_THREADS
if (!_eina_threads_activated) return EINA_LOCK_SUCCEED;
#endif
LeaveCriticalSection(mutex);
return EINA_LOCK_SUCCEED;
}
static inline void
eina_lock_debug(const Eina_Lock *mutex)
{
(void)mutex;
}
static inline Eina_Bool
eina_condition_new(Eina_Condition *cond, Eina_Lock *mutex)
{
cond->mutex = mutex;
#if _WIN32_WINNT >= 0x0600
InitializeConditionVariable(&cond->condition);
#else
cond->waiters_count = 0;
cond->was_broadcast = EINA_FALSE;
cond->semaphore = CreateSemaphore(NULL, // no security
0, // initially 0
0x7fffffff, // max count
NULL); // unnamed
if (!cond->semaphore)
return EINA_FALSE;
InitializeCriticalSection(&cond->waiters_count_lock);
cond->waiters_done = CreateEvent(NULL, // no security
FALSE, // auto-reset
FALSE, // non-signaled initially
NULL); // unnamed
if (!cond->waiters_done)
{
CloseHandle(cond->semaphore);
return EINA_FALSE;
}
#endif
return EINA_TRUE;
}
static inline void
eina_condition_free(Eina_Condition *cond)
{
#if _WIN32_WINNT >= 0x0600
/* Nothing to do */
(void)cond;
#else
CloseHandle(cond->waiters_done);
DeleteCriticalSection(&cond->waiters_count_lock);
CloseHandle(cond->semaphore);
#endif
}
static inline Eina_Bool
_eina_condition_internal_timedwait(Eina_Condition *cond, DWORD t)
{
#if _WIN32_WINNT >= 0x0600
SleepConditionVariableCS(&cond->condition, cond->mutex, t);
#else
DWORD ret;
Eina_Bool last_waiter;
/* Avoid race conditions. */
EnterCriticalSection(&cond->waiters_count_lock);
cond->waiters_count++;
LeaveCriticalSection(&cond->waiters_count_lock);
/*
* This call atomically releases the mutex and waits on the
* semaphore until <pthread_cond_signal> or <pthread_cond_broadcast>
* are called by another thread.
*/
ret = SignalObjectAndWait(cond->mutex, cond->semaphore, t, FALSE);
if (ret == WAIT_FAILED)
return EINA_FALSE;
/* Reacquire lock to avoid race conditions. */
EnterCriticalSection(&cond->waiters_count_lock);
/* We're no longer waiting... */
cond->waiters_count--;
/* Check to see if we're the last waiter after <pthread_cond_broadcast>. */
last_waiter = (cond->was_broadcast) && (cond->waiters_count == 0);
LeaveCriticalSection(&cond->waiters_count_lock);
/*
* If we're the last waiter thread during this particular broadcast
* then let all the other threads proceed.
*/
if (last_waiter)
{
/*
* This call atomically signals the <waiters_done_> event and waits until
* it can acquire the <external_mutex>. This is required to ensure fairness.
*/
ret = SignalObjectAndWait(cond->waiters_done, cond->mutex, t, FALSE);
if (ret == WAIT_FAILED)
return EINA_FALSE;
}
else
{
/*
* Always regain the external mutex since that's the guarantee we
* give to our callers.
*/
ret = WaitForSingleObject(cond->mutex, t);
if (ret == WAIT_FAILED)
return EINA_FALSE;
}
#endif
return EINA_TRUE;
}
static inline Eina_Bool
eina_condition_timedwait(Eina_Condition *cond, double val)
{
return _eina_condition_internal_timedwait(cond, (DWORD)(val * 1000));
}
static inline Eina_Bool
eina_condition_wait(Eina_Condition *cond)
{
return _eina_condition_internal_timedwait(cond, INFINITE);
}
static inline Eina_Bool
eina_condition_broadcast(Eina_Condition *cond)
{
#if _WIN32_WINNT >= 0x0600
WakeAllConditionVariable(&cond->condition);
return EINA_TRUE;
#else
Eina_Bool have_waiters;
/*
* This is needed to ensure that <waiters_count_> and <was_broadcast_> are
* consistent relative to each other.
*/
EnterCriticalSection(&cond->waiters_count_lock);
have_waiters = EINA_FALSE;
if (cond->waiters_count > 0)
{
/*
* We are broadcasting, even if there is just one waiter...
* Record that we are broadcasting, which helps optimize
* <pthread_cond_wait> for the non-broadcast case.
*/
cond->was_broadcast = EINA_TRUE;
have_waiters = EINA_TRUE;
}
if (have_waiters)
{
DWORD ret;
/* Wake up all the waiters atomically. */
ret = ReleaseSemaphore(cond->semaphore, cond->waiters_count, 0);
LeaveCriticalSection(&cond->waiters_count_lock);
if (!ret) return EINA_FALSE;
/*
* Wait for all the awakened threads to acquire the counting
* semaphore.
*/
ret = WaitForSingleObject(cond->waiters_done, INFINITE);
if (ret == WAIT_FAILED)
return EINA_FALSE;
/*
* This assignment is okay, even without the <waiters_count_lock_> held
* because no other waiter threads can wake up to access it.
*/
cond->was_broadcast = EINA_FALSE;
}
else
LeaveCriticalSection(&cond->waiters_count_lock);
return EINA_TRUE;
#endif
}
static inline Eina_Bool
eina_condition_signal(Eina_Condition *cond)
{
#if _WIN32_WINNT >= 0x0600
WakeConditionVariable(&cond->condition);
#else
Eina_Bool have_waiters;
EnterCriticalSection(&cond->waiters_count_lock);
have_waiters = (cond->waiters_count > 0);
LeaveCriticalSection(&cond->waiters_count_lock);
/* If there aren't any waiters, then this is a no-op. */
if (have_waiters)
{
if (!ReleaseSemaphore(cond->semaphore, 1, 0))
return EINA_FALSE;
}
#endif
return EINA_TRUE;
}
static inline Eina_Bool
eina_rwlock_new(Eina_RWLock *mutex)
{
#if _WIN32_WINNT >= 0x0600
InitializeSRWLock(&mutex->mutex);
return EINA_TRUE;
#else
if (!eina_lock_new(&(mutex->mutex))) return EINA_FALSE;
if (!eina_condition_new(&(mutex->cond_read), &(mutex->mutex)))
goto on_error1;
if (!eina_condition_new(&(mutex->cond_write), &(mutex->mutex)))
goto on_error2;
mutex->readers_count = 0;
mutex->writers_count = 0;
mutex->readers = 0;
mutex->writers = 0;
return EINA_TRUE;
on_error2:
eina_condition_free(&(mutex->cond_read));
on_error1:
eina_lock_free(&(mutex->mutex));
return EINA_FALSE;
#endif
}
static inline void
eina_rwlock_free(Eina_RWLock *mutex)
{
#if _WIN32_WINNT >= 0x0600
(void)mutex;
#else
eina_condition_free(&(mutex->cond_read));
eina_condition_free(&(mutex->cond_write));
eina_lock_free(&(mutex->mutex));
#endif
}
static inline Eina_Lock_Result
eina_rwlock_take_read(Eina_RWLock *mutex)
{
#if _WIN32_WINNT >= 0x0600
AcquireSRWLockShared(&mutex->mutex);
mutex->is_read_mode = EINA_TRUE;
#else
DWORD res = 0;
if (eina_lock_take(&(mutex->mutex)) == EINA_LOCK_FAIL)
return EINA_LOCK_FAIL;
if (mutex->writers)
{
mutex->readers_count++;
while (mutex->writers)
{
EnterCriticalSection(&mutex->cond_write.waiters_count_lock);
mutex->cond_read.waiters_count++;
LeaveCriticalSection(&mutex->cond_write.waiters_count_lock);
res = WaitForSingleObject(mutex->cond_write.semaphore, INFINITE);
if (res != WAIT_OBJECT_0) break;
}
mutex->readers_count--;
}
if (res == 0)
mutex->readers++;
eina_lock_release(&(mutex->mutex));
#endif
return EINA_LOCK_SUCCEED;
}
static inline Eina_Lock_Result
eina_rwlock_take_write(Eina_RWLock *mutex)
{
#if _WIN32_WINNT >= 0x0600
AcquireSRWLockExclusive(&mutex->mutex);
mutex->is_read_mode = EINA_FALSE;
#else
DWORD res = 0;
if (eina_lock_take(&(mutex->mutex)) == EINA_LOCK_FAIL)
return EINA_LOCK_FAIL;
if (mutex->writers || mutex->readers > 0)
{
mutex->writers_count++;
while (mutex->writers || mutex->readers > 0)
{
EnterCriticalSection(&mutex->cond_write.waiters_count_lock);
mutex->cond_read.waiters_count++;
LeaveCriticalSection(&mutex->cond_write.waiters_count_lock);
res = WaitForSingleObject(mutex->cond_write.semaphore, INFINITE);
if (res != WAIT_OBJECT_0) break;
}
mutex->writers_count--;
}
if (res == 0) mutex->writers = 1;
eina_lock_release(&(mutex->mutex));
#endif
return EINA_LOCK_SUCCEED;
}
static inline Eina_Lock_Result
eina_rwlock_release(Eina_RWLock *mutex)
{
#if _WIN32_WINNT >= 0x0600
if (mutex->is_read_mode)
ReleaseSRWLockShared(&mutex->mutex);
else
ReleaseSRWLockExclusive(&mutex->mutex);
#else
if (eina_lock_take(&(mutex->mutex)) == EINA_LOCK_FAIL)
return EINA_LOCK_FAIL;
if (mutex->writers)
{
mutex->writers = 0;
if (mutex->readers_count == 1)
{
EnterCriticalSection(&mutex->cond_read.waiters_count_lock);
if (mutex->cond_read.waiters_count > 0)
ReleaseSemaphore(mutex->cond_read.semaphore, 1, 0);
LeaveCriticalSection(&mutex->cond_read.waiters_count_lock);
}
else if (mutex->readers_count > 0)
eina_condition_broadcast(&(mutex->cond_read));
else if (mutex->writers_count > 0)
{
EnterCriticalSection (&mutex->cond_write.waiters_count_lock);
if (mutex->cond_write.waiters_count > 0)
ReleaseSemaphore(mutex->cond_write.semaphore, 1, 0);
LeaveCriticalSection (&mutex->cond_write.waiters_count_lock);
}
}
else if (mutex->readers > 0)
{
mutex->readers--;
if (mutex->readers == 0 && mutex->writers_count > 0)
{
EnterCriticalSection (&mutex->cond_write.waiters_count_lock);
if (mutex->cond_write.waiters_count > 0)
ReleaseSemaphore(mutex->cond_write.semaphore, 1, 0);
LeaveCriticalSection (&mutex->cond_write.waiters_count_lock);
}
}
eina_lock_release(&(mutex->mutex));
#endif
return EINA_LOCK_SUCCEED;
}
static inline Eina_Bool
eina_tls_new(Eina_TLS *key)
{
if ((*key = TlsAlloc()) == TLS_OUT_OF_INDEXES)
return EINA_FALSE;
return EINA_TRUE;
}
static inline void
eina_tls_free(Eina_TLS key)
{
TlsFree(key);
}
static inline void *
eina_tls_get(Eina_TLS key)
{
return (void*)TlsGetValue(key);
}
static inline Eina_Bool
eina_tls_set(Eina_TLS key, const void *data)
{
if (TlsSetValue(key, (LPVOID)data) == 0)
return EINA_FALSE;
return EINA_TRUE;
}
static inline Eina_Bool
eina_semaphore_new(Eina_Semaphore *sem, int count_init)
{
if (!sem || (count_init <= 0))
return EINA_FALSE;
*sem = CreateSemaphore(NULL, count_init, 32767, NULL);
if (!*sem)
return EINA_FALSE;
}
static inline Eina_Bool
eina_semaphore_free(Eina_Semaphore *sem)
{
if (!sem)
return EINA_FALSE;
CloseHandle(*sem);
}
static inline Eina_Bool
eina_semaphore_lock(Eina_Semaphore *sem)
{
DWORD res;
if (!sem)
return EINA_FALSE;
res = WaitForSingleObject(*sem, 0L);
if (res == WAIT_OBJECT_0)
return EINA_TRUE;
return EINA_FALSE;
}
static inline Eina_Bool
eina_semaphore_release(Eina_Semaphore *sem, int count_release)
{
if (!sem)
return EINA_FALSE;
return ReleaseSemaphore(*sem, count_release, NULL) ? EINA_TRUE : EINA_FALSE;
}
// FIXME: Implement proper spinlock = http://www.codeproject.com/Articles/184046/Spin-Lock-in-C
static inline Eina_Bool
eina_spinlock_new(Eina_Spinlock *spinlock)
{
return eina_lock_new(spinlock);
}
static inline Eina_Lock_Result
eina_spinlock_take(Eina_Spinlock *spinlock)
{
return eina_lock_take(spinlock);
}
static inline Eina_Lock_Result
eina_spinlock_take_try(Eina_Spinlock *spinlock)
{
return eina_lock_take_try(spinlock);
}
static inline Eina_Lock_Result
eina_spinlock_release(Eina_Spinlock *spinlock)
{
return eina_lock_release(spinlock);
}
static inline void
eina_spinlock_free(Eina_Spinlock *spinlock)
{
eina_lock_free(spinlock);
}
#include "eina_inline_lock_barrier.x"
#endif
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